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The following problems have been found by Coverity - static analysis tool.

mysql-5.5.31/plugin/semisync/semisync_master.cc:672:parameter_as_source – Note: This defect has an elevated risk because the source argument is a parameter of the current function. 

mysql-5.5.31/plugin/semisync/semisync_master.cc:661:parameter_as_source – Note: This defect has an elevated risk because the source argument is a parameter of the current function. 

mysql-5.5.31/plugin/semisync/semisync_master.cc:555:parameter_as_source – Note: This defect has an elevated risk because the source argument is a parameter of the current function.

diff -up mariadb-10.0.21/plugin/semisync/semisync_master.cc.orig mariadb-10.0.21/plugin/semisync/semisync_master.cc
--- mariadb-10.0.21/plugin/semisync/semisync_master.cc.orig	2015-08-05 20:11:31.000000000 +0200
+++ mariadb-10.0.21/plugin/semisync/semisync_master.cc	2015-08-10 17:22:31.700604043 +0200
@@ -553,7 +553,8 @@ int ReplSemiSyncMaster::reportReplyBinlo
 
   if (need_copy_send_pos)
   {
-    strcpy(reply_file_name_, log_file_name);
+    strncpy(reply_file_name_, log_file_name, sizeof(reply_file_name_)-1);
+    reply_file_name_[sizeof(reply_file_name_)-1] = '\0';
     reply_file_pos_ = log_file_pos;
     reply_file_name_inited_ = true;
 
@@ -661,7 +662,8 @@ int ReplSemiSyncMaster::commitTrx(const
         if (cmp <= 0)
 	{
           /* This thd has a lower position, let's update the minimum info. */
-          strcpy(wait_file_name_, trx_wait_binlog_name);
+          strncpy(wait_file_name_, trx_wait_binlog_name, sizeof(wait_file_name_)-1);
+          wait_file_name_[sizeof(wait_file_name_)-1] = '\0';
           wait_file_pos_ = trx_wait_binlog_pos;
 
           rpl_semi_sync_master_wait_pos_backtraverse++;
@@ -672,7 +674,8 @@ int ReplSemiSyncMaster::commitTrx(const
       }
       else
       {
-        strcpy(wait_file_name_, trx_wait_binlog_name);
+        strncpy(wait_file_name_, trx_wait_binlog_name, sizeof(wait_file_name_)-1);
+        wait_file_name_[sizeof(wait_file_name_)-1] = '\0';
         wait_file_pos_ = trx_wait_binlog_pos;
         wait_file_name_inited_ = true;
 

mysql-5.5.31/sql/rpl_handler.cc:306:fixed_size_dest – You might overrun the 512 byte fixed-size string "log_info->log_file" by copying "log_file + dirname_length(log_file)" without checking the length. diff -up mysql-5.5.31/sql/rpl_handler.cc.covscan-stroverflow mysql-5.5.31/sql/rpl_handler.cc

diff -up mariadb-10.0.21/sql/rpl_handler.cc.orig mariadb-10.0.21/sql/rpl_handler.cc
--- mariadb-10.0.21/sql/rpl_handler.cc.orig	2015-08-05 20:11:31.000000000 +0200
+++ mariadb-10.0.21/sql/rpl_handler.cc	2015-08-10 17:28:57.093803582 +0200
@@ -261,7 +261,8 @@ int Binlog_storage_delegate::after_flush
     thd->semisync_info= log_info;
   }
 
-  strcpy(log_info->log_file, log_file+dirname_length(log_file));
+  strncpy(log_info->log_file, log_file+dirname_length(log_file), sizeof(log_info->log_file)-1);
+  log_info->log_file[sizeof(log_info->log_file)-1] = '\0';
   log_info->log_pos = log_pos;
   
   FOREACH_OBSERVER(ret, after_flush, false,